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Finding the Fourth Proportional to 715.86, 988.36 and 450.40

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Solution

The fourth proportional to 715.86, 988.36 and 450.40 is: 621.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.86 : 988.36 = 450.40 : x
  2. Step 2: Convert to fraction form
    715.86/988.36 = 450.40/x
  3. Step 3: Cross multiply
    715.86x = 988.36 × 450.40
  4. Step 4: Simplify right side
    715.86x = 445,157.34
  5. Step 5: Solve for x
    x = 445,157.34/715.86
  6. Step 6: Final answer
    x = 621.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.